<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8">
    <title>My WebSocket</title>
    <script type="text/javascript">
        var websocket = null;
        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
            websocket = new WebSocket("ws://localhost:8080/websocket/" + getQueryString("uid"));
        }
        else {
            alert('Not support websocket')
        }

        //连接发生错误的回调方法
        websocket.onerror = function () {
            setMessageInnerHTML("error");
        };

        //连接成功建立的回调方法
        websocket.onopen = function (event) {

        }

        //接收到消息的回调方法
        websocket.onmessage = function (event) {
            setMessageInnerHTML(event.data);
        }

        //连接关闭的回调方法
        websocket.onclose = function () {
            setMessageInnerHTML("close");
        }

        //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function () {
            websocket.close();
        }
        //将消息显示在网页上
        function setMessageInnerHTML(innerHTML) {
            document.getElementById('message').innerHTML += innerHTML + '<br/>';
        }

        //关闭连接
        function closeWebSocket() {
            websocket.close();
        }

        //发送消息
        function send() {
            var message = document.getElementById('text').value;
            websocket.send(message);
        }
        function getQueryString(name) {
            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
            var url = decodeURI(window.location.search);
            var r = url.substr(1).match(reg);  //获取url中"?"符后的字符串并正则匹配
            var context = "";
            if (r != null)
                context = r[2];
            reg = null;
            r = null;
            context == null || context == "" || context == "undefined" ? "" : context;
//            alert(context);
            return context;
        }
    </script>
</head>

<body>
Welcome<br/>
<input id="text" type="text"/>
<button onclick="send()">Send</button>
<div id="message">
</div>
</body>
</html>
<script src="js/jquery.js"/>